porter/cable 6" random orbit sander (7336sp)

I would love to fix my old 7336sp. I have purchased a new one because
I need it to do my surfboard repair.
At first I thought it was just the brushes. When I got the new one I
did some part swaping and came to find that it was not the brushes or
the variable speed roller switch.
What is wrong with the tool? It seems to fluxuate in rpms. It also
seems as if the motor is producing more heat than normal. I ran both
tools new and old next to each other and the old one definitley is much
weaker.
If I can get some good direction I would love to fix the old one unless
the parts out weigh getting a new one.
Thanks for any advice
The DINGO

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